German Grandmaster (1950), theorist and writer. Austrian Champion in 1921.
Best results: Vienna 1921, 1st; Baden Baden 1925, 3rd; Dortmund 1928, 1st; Brno 1928, 1st; Berlin 1928, 2nd; Berlin 1930 1st; Swinemunde 1930, 1stand Margate II 1939, 1st.
In a match, he beat Richard Reti 5½-2½ in 1925.
A participant in the Olympiad of 1930 with a team bronze medal. He was mostly known for his contribution to the opening theory of the King’s Indian and Nimzo-Indian openings.